@article{DAN_1976_228_4_a5,
     author = {A. I. Koshelev},
     title = {On the smoothness of the solutions of quasi-linear elliptic systems of second order},
     journal = {Doklady Akademii Nauk},
     pages = {787--789},
     publisher = {mathdoc},
     volume = {228},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_4_a5/}
}